238 BOTANICAL GAZETTE [SEPTEMBER 
Apical meristems of monocotyl roots.—Daisy G. Scorr*® has investigated 
the root tips of Alisma, Butomus, Vallisneria, Ruppia, Zostera, Naias, Strati- 
otes, and Limnocharis. Her results support Dr BARy’s statement in reference 
to the roots of monocotyledons in general, namely that there are three distinct 
groups of initials, one giving rise to calyptrogen, another to dermatogen and pet 
iblem, and the third to plerome.—J. M. C 
Megaspores of Lepidostrobus.—Mrs.°D. H. Scott? has found that certain 
megaspores referred to Kipston’s Triletes belong to Lepidostrobus foliaceus, 
heretofore regarded as homosporous. They are peculiar in bearing a cOnepiot 
ous appendage, said to be suggestive of the so-called ‘swimming apparatus 
of Azolla. Many of these spores were found, and they are spoken of as “fairly 
common objects.”—J. M. C. 
N. Am. Hydnaceae.—BANKER®° has published a revision of the pileate forms 
of Hydnaceae found in North America north of Panama, and including the adja- 
cent islands. A few resupinate forms are included, but in general they ate 
excluded, awaiting an examination of the Berkeley types. Ten genera are pre 
sented, two of them being new (Leaia and Grandinioides), and of the 63 species 
10 are new.—J. M. C. 
Fossil germinating spores.—Scotts! has announced the discovery of ger 
minating spores in a sporangium of Stauropteris Oldhamia. The discovery ® 
important, for it has been in doubt whether this species should be regarded as 
a fern or a pteridosperm. The germination is distinctly fern-like, and confirms 
the anatomical resemblance of this species to the Botryopterideae.—J. M. C. 
Apple scab. LAWRENCE:? reports further studies of the apple scab in Wash- 
ington. In a comparative test-of the relative effects of the dust spray ore 
and the ordinary liquid Bordeaux it was found that the liquid was twelve times 
as effective as the dust spray. This is in accord with the results secured by 
CRANDALL‘S in Illinois—E. Mreap WItcox. 
48 Scott, Datsy G., The apical meristems of the roots of certain aquatic mon® 
cotyledons. New Phytol. 5:119-129. pl. 9. 1906. 
49 Scott, Rina, On the .megaspore of Lepidostrobus foliaceus. New 
5:116-19. pl. 8. figs. 24-25. 1906. 
s° BANKER, H. J., Acontribution to a revision of the North American Hydnaceat: 
Mem. Torr. Bot. Club 12: 99-1094. 6 
Phytol. 
st Scort, D. H., The occurrence of germinating spores in Stauroplerts Oldha 
6 
New Phytol. §:170-172. 1906. 
52? LAWRENCE, W. H., Apple scab in Eastern Washington. B 
Sta. 75:1-14. 1906. pli- 
53 CRANDALL, C. S., Spraying apples. Relative merits of liquid en oe i 
cations. Bull. Ill. Exp. Sta. 106:205-242. pls. 1-9. figs. I-5- 1906. : 
Bot. GAZETTE 42:157. 1906. . 
ull. Wash. Exp: 
